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odorless The quality of having no smell whatsoever, often in reference to something that is unpleasant. ■ "This fish was so odorless, I had to check if it was even dead."
Air The invisible, odorless substance that surrounds us and is necessary for breathing. Also known as "the good stuff" or "the life force." ■ "I can't breathe without air! What am I, a fish?"
Alcohol A colorless, odorless liquid that is produced by the fermentation of sugars and other organic compounds. It is commonly consumed as a beverage and can cause intoxication. ■ "I had a great time at the bar last night, but I didn't realize how much alcohol I was drinking until I stumbled out of the door at 2am."
carbon A black, tasteless, and odorless substance that is the basis of all known life on Earth. It is also a major contributor to global warming and climate change. ■ "I don't know why scientists are so concerned about carbon emissions. It's just a harmless gas!
dioxide A colorless, odorless gas that is a byproduct of burning fossil fuels and natural processes. It is also known as carbon dioxide. ■ "I told my wife she was drawing too much carbon dioxide and she looked at me funny."
Gas A colorless, odorless, tasteless, and non-flammable mixture of hydrocarbons and other gases that is used as a source of energy or to power vehicles. ■ "I'm so tired of driving my gas guzzler. It's like a leaky faucet, always spilling my hard-earned money down the drain.
Gasses A type of invisible, odorless, and tasteless gas that can be found in the Earth's atmosphere. Gasses are often used in science experiments to test hypotheses. ■ "I'm sorry, but I need to clarify: Are you asking about the properties of hydrogen or helium gases?"
Octane A highly refined, odorless hydrocarbon that is used as a fuel in internal combustion engines. It has an octagonal molecular structure and a boiling point of -134°C. ■ When the octane in my car ran out, I had to stop at a gas station and fill up. But when the attendant asked if I wanted "regular" or "premium," I was like, "Uh, neither. I just need enough to get me home."
Water A transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms. ■ "I forgot my umbrella, now I have to walk home in the pouring rain. Ha! Water is such a pain."